一个自绘制SPIN控件类CLBSpinButtonCtrl.该类实现了标准CSpinButtonCtrl控件所有的功能之外，还增加了自动使箭头变灰autodisabling的功能。-a category CLBSpinButtonCtrl SPIN controls. To achieve such a standard CSpinButtonCtrl controls all functions, has also increased the arrow so automatic greyed